Etymology
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hallow (v.)

Old English halgian "to make holy, sanctify; to honor as holy, consecrate, ordain," related to halig "holy," from Proto-Germanic *hailagon (source also of Old Saxon helagon, Middle Dutch heligen, Old Norse helga), from PIE root *kailo- "whole, uninjured, of good omen" (see health). Used in Christian translations to render Latin sanctificare. Related: Hallowed; hallowing.

hallow (n.)

"holy person, saint," Old English haliga, halga, from hallow (v.). Obsolete except in Halloween.

updated on May 13, 2015

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Definitions of hallow from WordNet

hallow (v.)
render holy by means of religious rites;
Synonyms: consecrate / bless / sanctify
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.